and measure the flame rectification signal in microamps (µA) using a multimeter in series with the sensor wire

When replacing a failed HVAC contactor

the issue may lie with the UCM or the inlet valve

a reading of "open" or infinite resistance indicates a broken circuit

ASCO 238710-004-D Coil 30067439-890 and measure the flame rectificationThe ASCO 238710 004 D Coil is a high performance 11. 6 Watt solenoid valve coil engineered for industrial 12VDC fluid control systems. Designed with a Class FT insulation rating, this replacement coil provides the thermal endurance required for continuous service in demanding HVACR and process applications. It is a direct fit for ASCO 8551 series valves and other compatible 8210G and 8262G series solenoid bodies, converting electrical energy into